Plumb-bob



(No Model.)

A. LEIDGEN.

PLUMB BOB.

Patented Nov; 3, 1885.

UNITED STATES PATENT GFFICEO ADAM LEIDGEN, OF MILWAUKEE, \VISCONSIN.

PLUMB-BOB.

EsBPECIFICATION forming part of Letters Patent No. 329,573, dated November 3, 1885.

Application filed January 5, 1885. Serial No.152,061. (No model.)

I 0 all whom it may concern:

Be it known that I, ADAM LEIDGEN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented certain new and useful Improvements in Plumb-Bobs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings,and to letters or figures of reference marked thereon, which form a part of this specification.

My invention, to be hereinafter specifically claimed, relates to improvements in plumbbobs.

My improvements consist in providing an adjustable and removable centering-rod, and a clamp or other equivalent means for securing the adjustment of the rod.

In the accompanying drawings, Figure 1 is a vertical cross section of the plumb-bob, showing my improvements in detail. Fig. 2 is a bottom end view of the clamp, the inclosed centering-rod, and the clamp-nut.

The same letters refer to like parts in both views.

In the drawings a bob is shown having an external Weighted case, A, vertically perforated centrally for the reception of the truncated cone-shaped core B. The core B is also provided with a central vertical cylindrical aperture and projects above the top of the case A, and is provided with a cap, 0, which cap is provided with a peripherally-milled flange, 1), around its open end, which cap is adapted to screw down upon said top end of the core B and strike against the top of the case A and retain it on the core B. This cup 0 is also provided with a small orifice, a, through its top centrally, through which is inserted the supporting plumb line or cord, which is made fast to the cap by a knot or other equivalent means within the cap. The core B terminates at its lower extremity outside of case A in a quadrafid cleft outwardlyextending tubular clamp, E, having its external surface inwardly inclined and screwthreaded toward its outer end and provided with the thereon-turning inwardly-screwthreaded milled nut F. The cylindrical rod D is fitted into the aperture in core B and is adjustable therein vertically by means of the clamp E and nut F. The rod D is at one extremity centrally pointed,which point 0 may, when the plumb is not in use, be protected from injury by withdrawing the rod and reversing it in the bob, thus inclosing and shielding the point.

The plumb-bob is especially serviceable in work where the line being attached at some place considerably above the bob is liable to stretch and would need to be reattached or readjusted at the place of its attachment above, but that this centering-rod D may be readily raised within the bob, thereby obviating a trip to the place of attachment of the line, or Where a lower point having been once established is covered bya plate of metal or otherwise, and the same plumb-point is to be again established on such plate, or when a plumb-point is desired to be located from some point above on a place just beneath or within a narrow or small opening, the rod D may be adjusted out several inches to pass through or down into such narrow or small Opening.

As before stated,I have shown in my drawings a form of bob having a core with a cen tral aperture for my adjustable centering-rod; but I do not wish to limit the application of my improvements to that form of bob having a core, as my improvements are equally adapted to a bob made in one solid piece which may be provided with a central aperture for the adjustable rod and with the projecting cleft-clamp and the thereon-turning clampingnut for securing the rod.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination of a plumb-bob provided with a central vertical aperture and a rod-retaining device in connection therewith, and an extensible centering -rod fitted and movable endwise in said aperture, said rod moving independently of and extending be yond the retaining device both above and beloW it, substantially as and for the purpose set forth.

2. The combination of a plumb-bob pro vided with a central vertical aperture, the therein-fitting vertically-adj ustable centeringrod,the outwardly-extending cleft-clamp havjustable in the aperture in the core B,substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

ADAM LEIDGEN.

Witnesses:

O. T. BENEDICT, THEO. SEAMAN.

and the central vertical rod D,fitting and ad- IO 

